MAX544 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – +5V, Serial-Input, Voltage-Output, 14-Bit DACs

19-1088; Rev 3; 12/99
+5V, Serial-Input, Voltage-Output, 14-Bit DACs
General Description
The MAX544/MAX545 are serial-input, voltage-output,
14-bit digital-to-analog converters (DACs) that operate
from a single +5V supply. They provide 14-bit perfor-
mance (±0.5LSB INL and ±0.9LSB DNL) over tempera-
ture without any adjustments. The DAC output is
unbuffered, resulting in a low supply current of 0.3mA
and a low offset error of 0.6mV.
The DAC output range is 0V to V_REF. For bipolar opera-
tion, matched scaling resistors are provided in the
MAX545 for use with an external precision op amp
(such as the MAX400), generating a ±V_REF output
swing. The MAX545 also includes Kelvin-sense con-
nections for the reference and analog ground pins to
reduce layout sensitivity.
A 16-bit serial word is used to load data into the DAC
latch. The 10MHz, 3-wire serial interface is compatible
with SPI™/QSPI™/MICROWIRE™, and it also interfaces
directly with optocouplers for applications requiring isola-
tion. A power-on reset circuit clears the DAC output to 0V
(unipolar mode) when power is initially applied.
The MAX544 is available in 8-pin plastic DIP and SO
packages. The MAX545 is available in 14-pin plastic
DIP and SO packages.
Applications
Digital Offset and Gain Adjustment
Instrumentation
Industrial Process Control
Automated Test Equipment
Data-Acquisition Systems
Features
o Full 14-Bit Performance Without Adjustments
o +5V Single-Supply Operation
o Low Power: 1.5mW
o 1µs Settling Time
o Unbuffered Voltage Output Directly Drives 60kΩ
Loads
o SPI/QSPI/MICROWIRE-Compatible Serial Interface
o Power-On Reset Circuit Clears DAC Output to 0V
(unipolar mode)
o Schmitt-Trigger Inputs for Direct Optocoupler
Interface
o Pin-Compatible 16-Bit Upgrades
(MAX541/MAX542)
Ordering Information
PART
MAX544ACPA
MAX544BCPA
MAX544ACSA
MAX544BCSA
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
8 Plastic DIP
8 Plastic DIP
8 SO
8 SO
INL
(LSB)
±1/2
±1
±1/2
±1
Ordering Information continued at end of data sheet.
Functional Diagrams
TOP VIEW
Pin Configurations
OUT 1
AGND 2
REF 3
CS 4
MAX544
RFB 1
OUT 2
8 V_DD ^{AGNDF 3}
AGNDS 4
7 DGND
REFS 5
6 DIN
REFF 6
5 SCLK
CS 7
MAX545
14 VDD
13 INV
12 DGND
11 LDAC
10 DIN
9 N.C.
8 SCLK
DIP/SO
DIP/SO
REFF
REFS
CS
LDAC
SCLK
DIN
MAX545
R_INV
V_DD
R_FB
14-BIT DAC
CONTROL
LOGIC
DATA LATCH
SERIAL INPUT REGISTER
RFB
INV
OUT
AGNDF
AGNDS
DGND
Functional Diagrams continued at end of data sheet.
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
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